package qcby.courseHelper;

import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.qcby.courseHelper.MysqlUtil;

/**
 * Servlet implementation class divideClass
 */
@WebServlet("/divideClass")
public class divideClass extends HttpServlet {
	private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public divideClass() {
        super();
        // TODO Auto-generated constructor stub
    }

	/**
	 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
		//response.getWriter().append("Served at: ").append(request.getContextPath());
		
		response.setCharacterEncoding("utf-8");
		response.setContentType("application/josn;charset=utf-8");
		
		String classID = request.getParameter("classID");
		
		String pageIndex = request.getParameter("page");
		String pageSize = request.getParameter("limit");
		
		int page = Integer.parseInt(pageIndex) -1;
		int limit = Integer.parseInt(pageSize);
		
		int id = Integer.parseInt(classID);
		
		String sql="select * from student,class where class.id=student.classID and class.id="+id;
		if(limit!=0) {
			if(page!=0) {
				sql += " limit " +limit *page +" ," +limit;
			}else {
				sql +=" limit 0," +limit;
			}
		}
		
		
		
		String[] colums ={"id","name","sex","school","class","grade"};
		String json = MysqlUtil.getJsonBySql(sql, colums);
		System.out.println(json);
		response.getWriter().append(json);
		
		
	}

	/**
	 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
		doGet(request, response);
	}

}
